Cisco IOS Software Releases 12.3 Mainline - Retirement Notification
The Cisco IOS Software Releases 12.3 Mainline has been retired and is no longer supported.
End-of-Sale Date : 2007-03-15
End-of-Support Date : 2012-03-15
Cisco's End-of-Life Policy
You can view a listing of available Networking Software (IOS & NX-OS) offerings that best meet your specific needs